Gioi Thieu Ve Omnet++

7/31/2019 Gioi Thieu Ve Omnet++

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OMNet++

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1. GII THIU1.1.OMNeT++lg?OMNeT++lvitttcacmtObjectiveModularNetworkTestbedinC++.

OMNeT++lmtngdngcungcpchongisdngmitrngtinhnhmphnghotngcamng.Mcch chnh cangdng lmphnghotngmngthng tin,tuynhindotnhphcpvlinhhotcan,OMNeT++cncsdngtrongnhiulnhvckhcnhmphngcchthngthngtinphctp,ccmngkiuhngi(queueingnetworks)haycckintrcphncng...

OMNeT++ cung cp sn cc thnhphn tng ng vi ccm hnh thc t.Ccthnhphnny(cncgilccmodule)clptrnhtheongnngC++,sauc tphp li thnhnhng thnhphnhaynhngmhnh lnhnbngmtngnngbccao(NED).OMNeT++htrgiaodinho,tngngviccm

hnh cu trc ca n ng thiphn nhn mphng (simulation kernel) v ccmodulecaOMNeT++cngrtddngnhngvotrongccngdngkhc.

1.2.CcthnhphnchnhcaOMNeT++ Thvinphnnhnmphng(simulationkernel)

Trnhbindchchongnngmthnhtrng(topologydescriptionlanguage)-NED(nedc)

Trnhbintpho(graphicalnetworkeditor)choccfileNED(GNED)

Giao

din

ho

thc

hin

m

phng,

cc

lin

kt

bn

trong

cc

file

thc

hinmphng(Tkenv)

Giaodindnglnhthchinmphng(Cmdenv)

Cngc(giaodinho)vthktquvectorura(Plove)

Cngc(giaodinho)mtktquvhngura(Scalars)

Cngctiliuhoccmhnh

Cctinchkhc

Cctiliuhngdn,ccvdmphng...

1.3.ngdngOMNeT++lmtcngcmphngcchotngmngbngccmodulecthitkhngi tng.OMNeT++ thngc sdng trongccngdngchyunh:

Mhnhhotngcaccmngthngtin


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Mhnhgiaothc

Mhnhhoccmngkiuhngi

Mhnhhocch thngabvix l(multiprocesser)hoccchthngphncngtheomhnhphntnkhc(distributedhardwaresystems)

nhgikintrcphncng

nhgihiuquhotngcacchthngphctp...

1.4.MhnhtrongOMNeT++MtmhnhtrongOMNeT++baogmccmodulelngnhauccutrcphncp.sucacaccmodulelngnhaulkhnggiihn,iunychophpngisdngcthbiudincccu trclogiccacch thngtrong thc tbngcccutrcmhnh.Ccmoduletraoithngtinvinhauthngquavicgiccmessage(message).Ccmessagenycthccutrcphctptu.Ccmodulecthgiccmessagenytheohaicch,mtlgitrctiptiachnhn,hailgiitheo

mtngdncnhsn,thngquacccngvccktni.

Ccmodulecthcccthamscaringn.Ccthamsnycthcsdngchnhsaccthuctnhcamodulevbiudinchotopologycamhnh.

Cc modulemc thp nht trongcu trcphncpng gicc thuc tnh.Ccmodulenyccoilccmodulengin,vchngclptrnhtrongngnngC++bngcchsdngccthvinmphng.


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2. TNG QUAN

2.1.Khi

nim

m

hnh

ho

OMNeT++cungcpchongi sdngnhngcngchiuqum tcu trccacchthngthct.

Ccmodulelngnhauccutrcphncp

Ccmodulelccitngcthcacckiumodule

Ccmoduletraoithngtinbngccmessagequaccknh

Ccthamscamodulelinhhot

Ngnngmttopology

2.1.1.CutrcphncpcaccmoduleMtmhnhtrongOMNeT++chaccmodulelngnhauccutrcphncp,traoithngtinvinhaubngcchgiccmessage.Mimhnhnythngbiudinchomth thngmng.Modulemccaonht trongcu trcphncpcgi lmoduleh thng.Modulenyc thchaccmodulecon,ccmoduleconcngcthchaccmoduleconcaringn.suphncpiviccmodulelkhnggiihn,iunychophpngisdngcthddngbiudinmtcutrclogiccamththngtrongthctbngcutrcphncpcaOMNeT++.

CutrccamhnhcthcmtbngngnngNEDcaOMNeT++

module

h

thng

module

n

gin

modulekthp

HnhI-2.1-CcmodulenginvkthpCc module c th cha nhiu module con v c gi l module kt hp. Ccmodulenginlccmoduleccpthpnhttrongcutrcphncp.Ccmodulenginchaccthuttoncamhnh.NgisdngtrinkhaiccmodulenginbngngnngC++,sdngccthvinmphngcaOMNeT++.

2.1.2.KiumoduleTtcccmoduled lnginhayphc tpu lcci tngc thcacckiumodule.Trong khim t ccm hnh, ngi sdng nh ngha ra cc kiu


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module;cci tngc thcacckiumodulenycsdngnhcc thnhphn ca cc kiumodulephc tp hn.Cui cng, ngi s dng tomodule hthngnhmtitngcthcakiumodulecnhnghatrc,ttcccmodulecamngulmodulecon(hoclconcamodulecon)camodulehthng.

Khimtkiumodulecsdngnhmtkhidngsn(buildingblock),skhngthphnbit lmtmodulenginhayphc tp.iunychophpngisdngc th tchccmodulengin ra thnhnhiumodulengincnhngtrongmtmodulekthp,vngclicthtphpccchcnngcamtmodulekthp trongmtmodulenginmkhngnhhnggncckiumodulecngisdngnhngha.

Kiumodulecthclutrtrongmtfileringr.iunychophpngisdngcthnhmcckiumodulelivtoramtthvinthnhphn

2.1.3.Message,cng,linktCcmoduletraoithngtinbngvicgiccmessage.Trongthct,messagecdng khung (frame) hoc l cc gi tin (packet) c truyn i trong mng. Ccmessage c th c cu trcphc tp tu . Cc module n gin c th gi ccmessageimtcchtrctipnvtrnhnhocgiitheomtngdnnhsnthngquacccngvcclinkt.

Thigianmphngaphng (local simulation time)camtmodule tng lnkhimodulenhncmtmessage.Messagec thn tmtmodulekhchocn t cngmtmodule (message ca chnhbn thnmodule - self-message cdngthchinbnhthi).

Cng(gate)lccgiaotipvoracamodule.Messagecgiiquacccngravcnhnvothngquacccngvo.

Miktni (connection)haycngi l linkt (link)c tobn trongmtmc

ntrongcutrcphncpcaccmodule:bntrongmtmodulekthp,mtktnic thc toragiacccngtngngcahaimodulecon,hocgiacngcamoduleconvicngcamodulekthp.

modulecha modulecha

S1 S2 S1 S2

moduleconktnivinhau moduleconktnivimodulecha

HnhI-2.2-CcktniTngngvicu trcphncpcamt m hnh,ccmessage thngdichuynquamtlotccktniviimbtuvktthclccmodulengin.Tpccktniitmtmodulenginvnmtmodulengincgilroute.Ccmodulekthphotnggingnhcccardboardboxtrongmhnh,trongsuttrong vic chuyn tip ccmessage gia cc thnhphnbn trong v th giibnngoi.


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2.1.4.MhnhtruyngitinMtktnicthcbathamsctrng.Nhngthamsnyrtthuntinchoccmhnhmphngmngthngtinnhngkhnghudnglmchocckiumhnhkhc.Bathamsnybaogm:

trngtruyn(propagationdelay) tnhbngs-giy.

Tslibit,ctnhbngsli/bit.

Tsdliu,ctnhbngsbit/s.

Cc thamsny ltuchn.Gi trcacc thamsny lkhcnhau trn tngktni,ph thucvokiuca linkt (haycngi lkiucaknh truyn -channeltype).

trngtruynltngthigianncamessagebtrikhitruynquaknh.

Tslibitnhhngnqutrnhtruynmessagequaknh.Tsnylxcsutccbitbtruynsai.Doxcsutmtmessagedinbittruynichnhxcl:

P(messagegiicnhnchnhxc)=(1-ber)ntrongberltslibitvnlsbitcamessage.

Ccmessage truyniu cmt c li, cny sc thit lpkhivic truynmessagecli.

T s d liu c tnh theo n vbit/s, v n c s dng tnh thi gian truyn mtgi tin.Khi tsny cs dng,qu trnh gi messagei trong mhnhstngngvivictruynbitutinvmessagectnhlnnisaukhi

bnnhnnhncbitcuicng.

A B

Messagegii

truynbtr

trngtruyn

tA tB

Messagenhnc

HnhI-2.3-Truynmessage


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2.3.SdngOMNeT++2.3.1.XydngvchythccmhnhmphngMtmhnhOMNeT++baogmnhngphnsau:

Ngnngmttopology-NED(filecphnmrng.ned):mtcutrc

camoduleviccthams,cccng...Ccfile.nedcthcvitbngbtkbsonthohocsdngchngtrnhGNEDctrongOMNeT++.

nhnghacutrccaccmessage(ccfilecphnmrng.msg):Ngisdngcthnhnghartnhiukiumesssagevthmcctrngdliuchochng.OMNeT++sdchnhngnhnghanysangcclpC++y.

Mnguncaccmodulengin.y lcc fileC++viphnm rngl.hhoc.cc.

Hthngmphngcungcpchotaccthnhphnsau:

Phnnhnmphng.Phnnychacodequn lqutrnhmphngvccthvinlpmphng.NcvitbngC++,cbindch vc

tcngdngviccfilethvin(ccfilecphnmrngl.ahoc.lib).

Giaodinngisdng.Giaodinnycsdngkhithchinqutrnhmphng, to s d dng cho qu trnh sa li,biu din (demonstration)hockhithchinmphngtheotngkhi(batchexecutionofsimulations).Cmtvikiugiaodin trongOMNeT++, ttcucvitbngC++,cbindchvtcngnhautrongccthvin(ccfilecphnmrngl.ahoc.lib).

ThchinmphngvphntchktquCcchngtrnhthchinmphng(thesimulationexecutable)lccchngtrnhclp,tclncthchytrnccmykhckhngcitOMNeT++hayccfile

mhnhtngng.Khichngtrnhkhing,nbtucfilecuhnh(thngthng l file omnetpp.ini). Fileny cha cc thit lp iu khin qu trnhm

phng thchin,ccbinchocc thamscamhnh...Filecuhnhcngc thc s dng iu khin nhiu qu trnhmphng, trong trng hp n ginnht lccqu trnhmphngnysc thchin ln ltbimtchng trnhmphng(simulationprogram).

uracaqutrnhmphnglccfiledliu.Ccfilenycthlccfilevector,ccfilevhnghocccfilecangisdng.OMNeT++cungcpmtcngchoPlovexemvvranidungcaccfilevector.Tuynhinchngtacngnn hiu rng kh m c th x l y cc file kt qu m ch dng ringOMNeT++;ccfilenyulccfilecnhdngcthccbiccgi

x l tonhccaccchng trnhnhMatlabhayOctave,hocc thcavobng tnhcaccchng trnhnhOpenOfficeCalc, Gnumerichay MicrosoftExcel.Tt cccchng trnhnyu cchcnng chuyndng trongvicphntchsho,vbiudin(visualization)vtquakhnngcaOMNeT++.

CcfilevhngcngcthcbiudinbngcngcScalar.Ncthvcccbiu,cc thdavo tphpcc to (x,y)vc thxutd liuvoclipboardc thsdng trongccchng trnhkhcnhmanhngphn tchchitithn.


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GiaodinngisdngMcchchnhcagiaodinngisdng lchenhngphnphc tpbn trongcu trc ca ccm hnh i vi ngi s dng, d dng iu khin qu trnhm

phng,vchophpngisdngckhnng thayiccbinhaycci tngbn trongcamhnh.iuny l rtquan trngiviphapht trinv sa litrongdn.Giaodinhocngcthcsdngtrnhdinhotngcamhnh.

Cngmtmhnhngisdngc th trnnhiugiaodinkhcnhaumkhngcnphithayigtrongccfilemhnh.Ngisdngcthkimthvsalirtddngquagiaodinho,cuicngcthchyndatrnmtgiaodinnginvnhanhchngchtrthchintheokhi(batchexecution).

CcthvinthnhphnCckiumodulec thclutinhngvtrc lpvichmchngthcscsdng.cimnycungcpchongisdngkhnhmcckiumodulelivinhauvtoraccthvinthnhphn.

CcchngtrnhmphngclpCcchngtrnhthchinqutrnhmphngcthclunhiuln,khngphthucvoccmhnh,sdngcngmtthitlpchoccmodulengin.Ngisdngcthchratrongfilecuhnhmhnhnoscchy.iunytokhnngchongisdngcthxydngnhngchngtrnh thchinlnbaogmnhiuqutrnhmphng,vphnphinnhmtcngcmphngclp.Khnnglinhhotcangnngmttopologycnghtrchohngtipcnny.

2.3.2.HthngfileSaukhicitOMNet++,thmcomnetpptrnhthngmycabnnnchaccthmccondiy.

Hthngmphng:

omnetpp/ thmcgccaOMNeT++bin/ cccngctrongOMNeT++(GNED,nedtool...)include/ ccfileheaderchomhnhmphnglib/ ccfilethvin

bitmaps/ ccbiutnghodoc/ ccfilehngdn,readme...

manual/ filehngdndngHTMLtictoc-tutorial/ giithiusdngOMNeT++api/ APIthamchiudngHTMLnedxml-api/ APIthamchiuchothvinNEDXMLsrc/ mnguncatiliu

src/ mnguncaOMNeT++nedc/ nedtool,trnhbindchmessagesim/ phnnhnmphng

parsim/ ccfilednhchovicthchinphntnnetbuilder/ ccfilednhchoviccngccfileNED

envir/ mngunchogiaodinngisdngcmdenv/ giaodinngidngdnglnh


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tkenv/ giaodinngisdngdatrnTcl/tkgned/ cngcsonthofileNED

plove/ cngcvvphntchuradngvectorscalars/ cngcvvphntchuradngvhngnedxml/ thvinNEDXMLutils/ cctinchkhc...

test/ bkimthlicore/ bkimthlichothvinmphngdistrib/ bkimthli...

Ccqutrnhmphngmucchatrongthmcsamplessamples/ thmcchaccmhnhmphngmu

aloha/ mhnhcagiaothcAlohacqn/ ClosedQueueNetwork...

ThmccontribchaccchngtrnhcthkthpviOMNeT++contrib/

octave/ scriptcaOctavedngxlktqu

emacs/ bnhducphpNEDchoEmacsNgoirabncngcthtmthyccthmckhcnhmsvc/,chaccthnhphntchhpchoMicrosoftVisualC++...


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error1e-8

datarate128000//bit/sec

endchannel

3.4.KhaiboccmodulenginCcmodule ngin l cc khi chng trnh cxy dng sn cho ccmodulekhc(cthlccmodulekthp).Ccmoduleckhaibobngtnvtheoquyctncaccmodulenycttnbtubngchciinhoa.

Ccmodulenginckhaibothngquacccngvccthams.

Cphp:

simpleSimpleModuleName

parameters:

//...

gates:

//...

endsimple

3.4.1.CcthamscamodulenginCc thams lccbinph thucvo tngmhnh.Tham scaccmodulengincsdngbicchm(haycncgilccthuttoncamodule)khai

botrongchnhmodule.Theoquycccthamsscttnbtubngchcithng.

Cc

tham

s

c

khai

bo

bng

cch

lit

k

tn

sau

t

kho

parameters.

Kiu

ca

ccthamscthlkius(numeric),hngs(numericconsthayvitgnlconst),gitrlogic(bool),kiuchui(string)hocxml.Khithamskhngkhaiborkiuthmcnhkiucathamslnumeric.

Vd:

simpleTrafficGen

parameters:

interarrivalTime,

numOfMessages:const,

address:string;

gates://...

endsimple

CcthamscthcgngitrtNED(khiccmodulecsdngnhcckhidngsncamtkhikthplnhn)hoctfilecuhnhomnetpp.ini.

Thamsngunhinvhngs


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Cc thamsckiu sc thct trvmtgi trngunhin theodngphnphiu(uniformlydistributions)hocccdngphnphikhc

Trongas trnghp,cc thams thngchnhngi trngunhinkhibtukhign,saugitrnycginguyn.Khiccthamsnyphickhai

bolhngs-const.Khaibomtthamslconstthgitrcathamsscxcnhmtlnduynhtkhibtuthchinmphngvsaugitrsccoi lhng s. (ChOMNeT++khuynkhchvickhaibomi thams lconsttrnhngtrnghpbnmunsdngchcnngtosngunhin).

ThamsXMLikhiccmodulecnuvolnhngthngtinphctphnkhnngmtcaccthams,khibncthsdngmtfilecuhnhmrng.OMNeT++cthcvxlccfilenythngquamtthamschatncafile.

Tccphinbn3.0trln,XMLccoilmtdngchunchoccfilecuhnhvOMNeT++cngtchhpsncccngcchophpngisdngcthlmviccviccfileXML.OMNeT++chabphn tchcphpXML(XMLparser),ckhnngcccfileDTD,sdngbnhmnhccfile(trongtrnghpmtfileXMLcthamchiutinhiumodulethnscngchphiloadmtln),cung cp cho ngi s dng kh nng chn lc ccphn trong ti liu thng quaXPath,thhinnidungcafileXMLthngquaDOM.

3.4.2.CccngcamodulenginCnglccimktnicamodule.imbtuvktthcmtktnigiahaimodulechnhlcccng.OMNeT++htrkiuktnimtchiu(ncng)dochailoicnglcngvovcngra.Ccmessagecgiitcngravcnhnvo t cng vo.Theoquyc,cc cng ct tnbt ubng ch cithng.

ychngtackhinimvccvectorcngtrongmt vectorcnglmttphpbaogmnhiucngn.

Cngckhaibobngcchkhaibo tn sau tkhogates.Cpdu [] thhinmtvectorcng.Ccthnhphncamtvectorcngcnhsbtut0.

Vd:

simpleNetworkInterface

parameters://...

gates:

in:fromPort,fromHigherLayer;

out:

toPort,

toHigherLayer;endsimple

simpleRoutingUnit

parameters://...

gates:

in:output[];


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out:input[];

endsimple

Kchthccamtvectorcngcthcxcnhsaudomiitngcthcamtmhnhcthcccvectorcngckchthckhcnhau.

3.5.KhaibomodulekthpModulekt hp l ccmodule c th chamthocnhiu ccmodule con.Btkkiumoduleno(nginhaykthp)ucthcdngnhlmtmodulecon.Cng ging nh cc module n gin, cc module kt hp cng c cc cng, ccthamsvchngcthcsdngbtkchnomccmodulengincthcsdng.

Hnh tnghochng tac th tngtngccmodulekthpgingnhcchpbacngmchng tac thgiuphnmhnhmphngvcccu trcphc tpbntrongn.Khngccchnhvitchcc(activebehaviour)nolinquannccmodule kt hp - chng ch n gin l mt nhm ccmodule kt hp trongmtthnhphnlnhncthcsdngnhmtmhnhhocnhmtkhidngsnchoccmodulekthpkhc.

Theoquyc, tncaccmodule (baogmckiumodulekthp)ucbtubngchhoa.

Ccmoduleconcthsdngccthamscamodulecha.Ccmoduleconnycthktnivinhauhoc/vktnivimodulekthpchachng.

Vickhaiboccmodulekthpcngtngtnhkhaiboccmodulengin.Phn khaibo cngbao gm cc t khoparameters v gates, ngoi ra n cn sdngthmhaitkholsubmodulesvconnections.

Cphp:

moduleTn_module

parameters:

//...

gates:

//...

submodules:

//...

connections:

//...

endmodule

Chlttccckhaibo trn(parameters,gates,submodules,connections)chltuchn.


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3.5.1.CcthamsvcngcamodulekthpCcthamsvcngcamodulekthpcngckhaibovhotngtngtnhccthamsvcngcaccmodulengin.

Ccthamscamodulekthpcthcsdngbiccmoduleconvthngcdngkhitogitrchoccthamscaccmodulecon.

Ccthamscngcthcsdngxcnhcutrcbntrongcaccmodulekthp:sccmodulecon,kchthccaccvectorcngmtkhcccthamsnycngcthcsdngxcnhccktnibntrongmodulekthp.

Ccthamsnhhngncutrcbntrongcamodulennckhaibolconstgitrcathamskhngthayitheocclntruynhp.Trilinuccthamsckhaibo lccgi trngunhin,ngisdngc thscccgi trkhcnhaumilnthamsctruynhptrongqutrnhxlcamodulekthp.

Vd:

moduleRouter

parameters:

packetsPerSecond:numeric,

bufferSize:numeric,

numOfPorts:const;

gates:

in:inputPort[];

out:outputPort[];

submodules://...

connections://...

endmodule

3.5.2.CcmoduleconCcmoduleconckhaibo sau tkhosubmodules.Theoquycccmoduleconcttnbtuvichcithng.

Ccmoduleconcthlmtmodulenginhocmtmodulekthp.TrnhbindchNEDphibitckiucamoduledoccmoduleconphickhaibosmhnhoccimporttccfileNEDkhc.

Ngi s dng cng c kh nng to ra cc vectormodule con v kch thc cavectornycthnhnvotgitrcamtthams.Khikhaiboccmodulecon,

bncnphigngitrchoccthamscamodulevnukiumoduletngngcsdngccvectorcngthbnphixcnhchonmtkchthccth.

Vd:

moduleTn_Module_kt_hp

//...

submodules:


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tn_module_con_1:Kiu_Module_1

parameters:

//...

gatesizes:

//...

tn_module_con_2:Kiu_Module_2

parameters:

//...

gatesizes:

//...

endmodule

Vectormodule

Vectormodulelmttphp(mtmng)ccmodulecon.Kchthccavectorcthcbiudinbngmtbiuthcttrongcpdungocvung[].Biuthcnycththamchiunccthamscamodule.Gitr0chosccmodulecngcchpnhn.

Vd:

moduleCompoundModule

parameters:

size:const;

submodules:

submod1:Node[3]

//...

submod2:Node[size]

//...

submod3:Node[2*size+1]

//...

endmodule

3.5.3.ThamstnkiumoduleconVic

s

dng

tn

ca

cc

kiu

module

nh

cc

tham

s

to

iu

kin

d

dng

cho

sdngccmodulecon. Ly vd, cho rngmcch ca qu trnhmphng l sosnh skhcnhaugiacc thut ton tmng.Gi sbn lp trnhcc thutton tm ng cn thit nh cc module n gin DistVecRoutingNode,AntNetRouting1Node, AntNetRouting2Node, ... Bn cng to ra mt topologymngnhmtmodulekthpgilRountingTestNetworkphcvchovicnhgihotngcacc thut ton.Hin tiRountingTestNetworkangsdng thuttonDistVecRoutingNode(ttcccmoduleconuckiuny)vbnmunc


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thchuyniqualimtcchddnggiaccthuttontinlichovicnhgi.

thc hin iu ny ta c th s dng thm mtbin l routingNodeType chomoduleRoutingTestNetwork.ngthibncngkhaibochoNEDccmoduleconcaRoutingTestNetworkkhngckiucnh,mkiucaccmodulenyclgi tr cabin routingNodeType.Khi mngmphng cabn c th d dngthay i cc thut ton trn thng qua gi tr ca tham s nhDistVectRoutingNode, AntNetRouting1Node hoc AntNetRouting2Node.Trongtrnghpgitrcathamslsai(chatncamtkiukhngtnti)qutrnhmphngsblikhibtuchy-moduletypedefinitionnotfound(khaibokiumodulekhngctmthy).

Bn trongmoduleRoutingTestNetwork, tac thgngitrchocc thamsvtinhnhktniviccmodulechaccthuttontmngtngng.Tuynhintng tnhchnhxc,mbo tnca thamsvcngmbnsdng lchnhxc,

NEDcncsgiptbn.Bnc thkhaibo thmmtmodule(gis tn lRoutingNode)vphimbo chcchn rng ttcccmodule mnh sdngthngqua thams routingNodeTypeuccc thamsvcccnggingnhca

moduleRoutingNode.

Cphp:

moduleRoutingTestNetwork

parameters:

routingNodeType:string;//shouldholdthename

//ofanexistingmoduletype

gates://...

submodules:

node1:routingNodeTypelikeRoutingNode;node2:routingNodeTypelikeRoutingNode;

//...

connectionsnocheck:

node1.out0-->node2.in0;

//...

endmodule

onmnynunhn theogccangnngC++ thRoutingNodengvaitrcamtlpcs,DistVecRoutingNode,AntNetRouting1Nodelcclpktha t

lpRoutingNode.ThamsroutingNodeTypetngngvicontrtrtilpcs.ModuleRoutingNodekhngcncthchintrongC++bikhngcitngcthnocanctora,nchnthuncdngkimtratnhchnhxccafile NED. Mt khc, cc module thc s s c thay th (v d nhDistVecRoutingNode,AntNetRouting1Node,...)skhngcnphikhaibotrongfile

NED.


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submodules:

node:Node[count]

parameters:

position="middle";

parameters

if

index==0:position="beginning";

parametersifindex==count-1:

position="end";

gatesizes:

in[2],out[2];

gatesizesifindex==0||index==count-1:

in[1],out[1];

connections:

//...

endmodule

Chccgi trmcnhnnckhaibou tinbivNEDsduyt t trnxungdi,nugpiukinngthccgitrtngngscchnvoccgitrmcnh trc.Trongtrnghpkhaibogi trmcnhcuicng,gitrmcnhscthchnvogitrcamttrnghpiukinngtrc.

3.5.7.KtniCcktnich rac thcchcccngcamodulekthpgiao tipvicccngtngngcamodulecon.

Ktnicthctoragiahaimoduleconhocgiamoduleconvimodulecha(modulekthp) trctipchan(trongmtst trnghp,mtktnicngcthc to ragiahaicngcacngmtmodulekthp).iunycngha l

NEDkhngchophpmtktniacp(ktnigiahaimodulexanhautrongcutrcphn cp). Hn ch ny lm tng tnh c lp v kh nng dng li ca mimodule.Ngoira,hngcamodulecngrttrongquantrngkhitoktni.Khngthtomtktnigiahaicngrahocgiahaicngvovinhau.

NEDchhtrkiuktnimt-mtdomtcngringbitcsdngchxuthin mt ln trongmt kt ni. Kiu kt nimt-nhiu v nhiu-mt cng c thctorabngcchsdngccmodulengintrongcclungmessagecnhnihoccghpthm(duplicatemessageormergemessageflows).

Ccktniclitksautkhoconnectionsvcphntchvinhaubngduchmphy.

Vd:

moduleCompoundModule

parameters://...

gates://...


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submodules://...

connections:

node1.output-->node2.input;

node1.inputnode[1].in++;

node[0].in++node[2].in++;




node[4].in++


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Cthxuthintrongmtvnglp(toranhiuktni).

Cthliukin.

KtninvknhtruynNubnkhngxcnhmtknhtruyn,thktniskhngctrvkhngcbit

likhitruyn.Bncthxcnhmtknhtruynthngquatn.Vd:

node1.outGate-->Fiber-->node2.inGate;

TrongtrnghpnyfileNEDphickhaiboloiknhtruyntrn.Hocngisdngcngcthxcnhtrctipmtknhtruynquaccthamsctrng.

Vd:

node1.outGate-->error1e-9delay0.001-->node2.inGate;

Khngnhtnhphikhaiboyccthamsvccthamscthckhaibotheobtkthtno.

KtnivnglpNumoduleconhocccvectorcngcsdng,NEDchophpngisdngcthtoranhiuhnmtktnivimtkhaibo.cgilmtaktnihaymtktnivnglp.

fori=0..4do

node1.outGate[i]-->node2[i].inGate

endfor;

Mtaktnithcchtlmttphpccktninckhaibognhnnhculnhvnglpfor...do...endfor.

HnhI-3.1-aktniCcktniciukin

Ngisdngcthsdngtkhoifrngbuciukinkhitoccktni.Vd:

fori=0..ndo

node1.outGate[i]-->node2[i].inGateifi%2==0;

endfor;

Nocheck


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Mcnh,NEDquynh ttccccnguphicktnidovy trongnhiutrnghpvickimtranyc thgynhiuphinphc.ttbchcnngny

bncthsdngtkhonocheck.

3.6.Khaibomng thc s tomtmhnh mphngchyc thngi sdngphikhaibomng.Vickhaibomngstoramtmhnhmphngnhlmtitngcthcamtkiumodulenhngha trc.Kiumoduley thng lmtmodulekthp, tuynhincngc th toramtmngch lmtmodulenginclp.

CthkhaibonhiumngtrongmthocnhiufileNED.ChngtrnhmphngsdngccfileNEDscthchybtcmtmngno.Nubnmuncthmtmngnocthchinbncthchrtrongfilecuhnh(omnetpp.ini).

Cphpkhaibomngcngtngtnhkhaiboccmodulecon:

networkwirelessLAN:WirelessLAN

parameters:

numUsers=10,

httpTraffic=true,

ftpTraffic=true,

distanceFromHub=truncnormal(100,60);

endnetwork

yWirelessLANltncamtkiumodulekthpnhnghattrc,trongc thchacckiumodulekthpkhcnhWirelessHost,WirelessHub...Mt

cch

t

nhin,

ch

cc

kiu

module

khng

c

cng

mi

c

th

c

dng

trong

cckhaibomng.

3.7.CcbiuthcCcbiu thcc sdng trongNEDcvit theo cphpcaC++.Ccbiuthc dng cc ton t caC++, c th s dng cc tham s theo c hai hnh thctruyn theo tham tr hoc thambin, c thgi cc hmcaC++, nhn ccgi trngunhinhocyucunhptngisdng...

Khimtthamscgntrbngmtbiuthcthgitrbiuthcchctnhmi ln tham s c gi ti (tr khi tham s c khaibo const).iu ny c

ngha lmtmodulen gin s dngmt tham s khng c khaibo const snhncccgi trkhcnhaumi lngi thams trongqu trnhmphng.Cc

biuthckhc(chaccthamsckhaiboconst)schctnhmtln.CcthamsckiuXMLcthcdngtruynhpvoccfileXMLhaymtphnno ca cc file ny.Tham s kiuXML c th c gn gi trbng ton txmldoc().


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3.7.1.HngsHngshcHng shc thng lcc sdng thpphnhoccc s thpphnviduphyng.

HngchuiktHngchuiktckhaibogiacpdungockp.

Hngthigiansdnghngthigianbnphisdngthmcctkhochnvthigian.

Vd:

...

parameters:

propagationDelay=560ms,//0.560giy

connectionTimeout=6m30s500ms,//390.5giy

recoveryIntvl=0.5h;//30pht

Ccnvthigiancthcsdng:

nv ngha

ns nano giy

us microgiy

ms miligiy

s giy

m pht(60giy)

h gi(3600giy)

d ngy(86400giy)

3.7.2.ThamchiuCcbiuthccthsdngccthamscamodulekthptrctipchanvcaccmodulenginckhaibotrctrongfileNED.

Cphp:submod.paramhocsubmod[index].param.

Chaitkhocthcsdngvitncathams:ancestorvref.

ancestorcnghalnumtmodulekthpkhngchamtthamsno,ththams s c tm kim trong cc module cp cao hn trong cu trcphn cp.ancestorkhngckhuynkhchsdngbivnxmphmtikhinimng


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githngtin(encapsulation)vcthchckimtratrongthigianchy.Nchnncsdngtrongmtstnhngtrnghpthcscnthit.

reflygitrcathamsbngphngphpthamchiu,cnghalvicthayigitr ca tham s trong thi gian chy s gy nh hng ti tt c ccmodule thamchiu tithamsny.Cnggingnhancestor,refnncsdnghnch.Mttrnghpcthsdngreflkhiphiiuchnhmhnhtrongthigianchytmiukintiu.Ngisdngcthkhaibomtthamsmccaonhtcamhnhvtccmodulekhcthamchiutithamsny.Khibn thayithams ny trong thi gian chy, n s nh hng ti tonbm hnh.Trongmt strnghpkhc,ccthamscthamchiucthcdngnhccbintrngthiiviccmodulebncnh.

3.7.3.CctontCctontchtrtrongNEDcngtngtnhcctonttrongC/C++,tuynhincngcmtskhcbit:

Du^cdngchophptnhlutha(khngphilphpXORccbitnhtrongC).

Du#csdngchophptonlogicXOR(tngtnhdu!=)v##cdngchophptonbitXOR.

Thtutincaccphptonbit(&, |,#)lcaonhtsovicctontquanhkhc.

TtcccbintrongNEDuckiudoubles.ivicctontbit,kiudoublescchuynthnhkiuunsignedlongbnghmchuynicsncaC/C++(typecast), sau khiphp ton c thc hin kt qu s c chuyn i li thnh kiudoubles. Tng t i vi cc ton t logic &&, || v ##, cc ton hng s cchuynsangkiubool(typecast)vsauktqus licivkiudoubles.iviphpchialyphnd(%),tonhngscchuynsangkiulong.

Danhschcctontvthtutin:

Tont ngha

-,!,~ dum,phnh,lyphnbcabit

^ phptonlutha

*,/,% phpnhn,chia,chialyphnd

+,- phpcng,tr

phpdchbit

&,|,# phptonbitand,or,xor

== sosnhbng

!= sosnhkhc


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>,>=


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xmldoc() nhn vo tn file.Vd:xmlparam=xmldoc(someconfig.xml);

xmldoc() nhn vo tn file cng thmXPath,biu thc ch ramt element c thc chn trong file XML.Vd:xmlparam=xmldoc("someconfig.xml","/config/profile[@id=2]");

3.7.6.XMLvXPathThamsXPathcatontxmldoc()chramtelementcthtrongfileXML,iunychophpddngninhiufilecuhnhdngXMLnhthnhmtfilelnhn.

NubiuthcXPathphhpvinhiuelementtrongfilethelementutin(thtduyttheochiusu)scchn.

Cphpcabiuthc:

Biuthcchangdntrongccthnhphncphntchbngdu/hoc//.

Ccthnhphncangdncthltnth(tagname)caccelement,du*,. hoc ...Tn th ca cc element v du * c th c thmbiu thcm tthuctnhcaelementtheodng[vtr]hoc[@thuc_tnh=gi tr].VtrcaccelementtrongfileXMLctnhbtut0.

Du/cnghalxtccelementcon;du//sxtnccelementbtkcpnonmdielementhinthi.

Du ., .. v * ln lt i din cho element hin thi, element cha vmtelementvitnbtk.

Vd:

/fooelementgc(rootelement)ctnl

/foo/barelementconutincaelementgc

//barelementutinbtkcpno(duyttheochiusu)

/*/barelementconutincaelementgcctnbtk

/*/*/barelementconutindihaicpcaelementgc

/*/foo[0]elementconutincaelementgc

/*/foo[1]elementconthhaicaelementgc

/*/foo[@color=green]elementconutincthuctnhcolorcgitrbnggreen

//bar[1]mtelementvtrbtknhngphilelementthhai

//*[@color=yellow]btkelementnobtkvtrnocthuctnh"color"cgitrbng"yellow"

//*[@color=yellow]/foo/bar element conu tin ca element conutincamtelementcthuctnhcolorbngyellowvtrbtk.

3.7.7.HmTrongNED,bncthsdngcchmtonhcsau:


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Rtnhiuhmc trong thvin toncaC (math.h)nh exp(), log(), sin(),cos(),floor(),ceil()...

Cchmtogitrngunhin:uniform,exponential,normal...

3.7.8.GitrngunhinCcthamstrkhickhaibolconst,nukhnggitrcaccthamsthnglccgitrngunhin.Ccgitrnylkhcnhaumilnthamscgin.Cc gi tr ngu nhin c sinh ra nhb to s ngu nhin (RandomNumberGenerator-RNG)caOMNeT++.

Hm Mt

Lutphnphilintc

uniform(a,b,rng=0) lutphnphiutrongkhong[a,b)

exponential(mean,rng=0) lutphnphitheolutsmvigitrtrungbnhmean

normal(mean,stddev,rng=0) lutphnphibnh thng vi gi tr trungbnhmeanvlchchunstddev

truncnormal(mean, stddev,rng=0)

lutphnphibnh thng loib cc s khngm

gamma_d(alpha,beta,rng=0) lutphnphigammavialpha>0vbeta>0

beta(alpha1,alpha2,rng=0) lutphnphibetavialpha1>0valpha2>0

erlang_k(k,mean,rng=0) lutphnphiErlangvik>0phavgi tr trungbnhmean

chi_square(k,rng=0) lutphnphichi_squarevik>0tdo

student_t(i,rng=0) lutphnphistudent_tvii>0tdo

cauchy(a,b,rng=0) lutphnphiCauchyvicc tham sa,b trongb>0

triang(a,b,c,rng=0) lutphnphitamgicviccthamsa0,b>0

pareto_shifted(a,b,c,rng=0) lutphnphiParetotngqutviccthamsa,


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bvdchc.

Lutphnphirirc

intuniform(a,b,rng=0) lutphnphi u vi cc s nguyn nm trongkhonga..b

bernoulli(p,rng=0) kt qu caphp th Bernoulli vi xc sutp,0


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mttnkhcvitnmhmcgikhisdng.Trongtrnghphmkhngtrvkiudoublebncngcthlmtngt.

#include

longfactorial(intk)

{

...

}

staticdouble_wrap_factorial(doublek)

{

returnfactorial((int)k);

}

Define_Function2(factorial,_wrap_factorial,1);


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4. GII THIU GNED

4.1.Giao

din

GiaodincaGNEDhtrhaich:

ho(Graphics):lgiaodinmcnh.

Mngun (NEDSource):chophpngi sdngc th sa limngunmtcchtrctip.

HaikiugiaodinnycthanhCommandBarlkhcnhau.ivichho,thanhCommandBarcdng:

NewNEDfile:tomtfileNEDmi.GNEDchophptonhiufileNEDcngmtlc.

OpenNEDfile:mmtfileNED.

SaveDocument:GhifileNEDhinthi.


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Addnewcomponent tocurrentNED file:mtdanh sch thxung (dropdownlist) chophp ngi s dngmt trong 5 thnhphn c th thm vo fileNED:Import,Channel,SimpleModule,CompoundModulevNetwork.

Backtopreviousview:quaylichgiaodintrctrongHistory.

Forwardtonextview:chuyntichgiaodintiptheotrongHistory.

Select,move or resize itemsbutton: khi nt nyc kch hot, n chophpngisdngcthchn,dichuynvthayikchthcccitngtrongchho.

Drawsubmodulesandconnection tool:Cngc toccmoduleconvccktni.Kchchutvkor toccmodulecon.Kchchutbn trongmtmodule

conkorsangmodulekhc toktnimtchiugiahaimodule.tomt ktnihaichiutathchinvictoktnimtchiuhailntheochiungcnhau.

Appearance of selected items:Chc nng hot ng khimt (v chmt) itng c chn.N s lm xut hin cc trnh n nh SubmoduleAppearance,Module Appearance hayConnectionAppearance.Cc trnh n ng cnh ny cho

phpbnmtchititchoitngcchn.

Propertiesofselecteditems:thuctnhcaitngcchn.

Snaptogridon/offswitch:bt/ttchbtdnhvoliim.

Fitcompoundmodule toareacontent:nntny s lmchobincamodulechacmrngrachatrnvnbincattcccmodulecon.

Trong

ch

NED

Source,

thanh

Command

Bar

c

dng:

BnntucchcnngtngtnhtrongchGraphic.

Backtopreviousmodule:kchhotmodulechntrc.

Forwardtonextmodule:kchhotmoduletiptheo.

Cut:dichuynvoclipboard.

Copy:saochpvoclipboard.

Paste:dntclipboard.

Undo:hubthaotcvathchin.

Redo:lplithaotcvahub.

FindText:tmkimtrongvnbn.Chcnngnyslmxuthinhpthoi:


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Hp thoi chophp tmkimvi cc chc nng (b lc): regular expression, casesensitive...

PhnbntricagiaodinlTreeView.TreeViewchophpquanstttcccfilevccmoduleangcm.

HaimcnedfileUntitledcnhdumunhcnh lhaifilenychaSave.

Nubn kchphichutvo mtmcno trongTree View, mt trnhn ngcnhshinra.Trnhnnychaccthao

tccbnmbncththao

tcv

i

itngtngng.

KhibnmisdngGNED,sthngcmtcasnhhinlnmilnbnthchinmtthaotc.Casnygiithchchobncchthchotngcamtschcnngphctp tronggiaodincaGNED.Bncttchcnngnybngcchnhduvohpchnphadicacas.ylmtchcnngrthuchvvykhi

bnttchcnngnyi,munnxuthintrlibnphixofile.gnedrc.


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4.2.MtsthaotccbnTomtmodulecontrongmodulekthp

Kch thccamodulekthp s tngiuchnhchophhpvimoduleconctora.Nhni trnnubn lmtngisdngmi,scmtcashngdnnhxuthin:

NhnOK,tngtbntothmmtvimodulenhtronghnhv:


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Tiptheotasdngcngc chnmttrongccmoduleconvactora.Bincamodulecchnchuynthnhmu.

nnt ,bnsthytrnhnngcnhSubmoduleAppearance:

Trnh n ny chophp ngi s dng c th thay i hnh dng camodule contngng. Kchchnchcnng Iconchn mt Iconbiudin cho modulequatrnhduytho.


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BncthsdngnhngIconcsncaOMNeT++hoccththmccIconcaringmnhbngcchcopyccfilebitmapvothmcbitmapcaOMNeT++.

ChnIconballvikchthctrungbnh(normal).TacngcththayimuscchoccIcon.

Chuyn Iconball tmuxmsangmuxanh:kchvohnhchnhtbncnhColorizeicon,mtbngchnmushinra


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Saukhichnmuxanh,bygibncthxemlihnhdngcamoduleconmbnvamithayisovihnhchnhtcaccmodulec.

ChuynsangchnhnNEDSource

Bncththymnguncamhnhmbnvato:

Chlivimoduleconthnhtnhngthayivmthnhthccancdinttrongchuii=ball,#0080ff.Bngcchsdngccchcnngcopy,pasteta


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cththayihnhthcchoccmoduleconcnlimkhngcnphimtrnhnSubmoduleAppearancechotngmoduletngng.

sinhnghn, ta thayi thamsmuscchoccmodulecn li,submod1thnh#ff80ffvsubmod2thnh#ff8000.Ktqucthhinhnhdi:

Nhvy trongGNED,haichgiaodincnhhngqua li lnnhau.Nhngthayitrongchnycngnhhngnchcnli.

Bygichngtassdngccmodulenythnghimchcnngcabtos

ngunhin(RandomNumberGenerator-RNG).Trctin,kchphichutvotngmodulevchnchcnngRenameitnchoccmoduletheothtlnltlrng,checkervcounter.

rngssinhraccsrichuynquachochecker.checkerstnhlitrnmisvchchuynchocounterccschn,ccslsbbi.countersghilislng schn mnhn c trong tngpht,vsny sc truyni choccthnhphnbnngoikhicyucu.

Tasdngcngc toktnitheomhnhmttrn.rngphinivicheckervcheckernivicounter.


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countercncnhimvnhnvgimessageviccthnhphnbnngoi,dotaphi to thmccktnicn thit.ktnimtmodulevibnngoi,ko rchutttmmoduletibincavngmuxm.ktninylhaichiu, tatinhnhtoktnitheochiungclitbinvotmcamodule.

Bygi tai tnchomodulekthp thnh rnd_evalbngcchkchphi chutvo dng ch Module nm gc trn tri ca vng mu xm, chn chc nng

Rename

trong

trnh

n

ng

cnh

tng

ng.

Save file vi tn Random_Number_Evaluator.ned, chng ta cmt fileNEDhonchnh.

4.3.LmvicvinhiufileNED-Ccchcnngchnhsanngcao

Nhn nt to mt ti liuNED mi. To mt module con mi c tn lconductor.


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Saukormodulernd_evalcafiletavatotrnvomoduleModulecafilemibaln.

Cc module rnd_eval s ln lt c t tn l rnd_eval, rnd_eval1,rnd_eval2.Sautatoktnihaichiugiamoduleconductorviccmodulernd_evalvathmvo.Moduleconductorsthnhthongyucuccsliucaccmodulernd_evalvccmodulenysgimessagetrli.


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QuansttrnTreeView,tasthyccktnivactngtora

VfileNEDcngcnhngthayitngng


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Savefileminyvitnconductor.ned.

thnghimcachng ta thcshotng,chng tacnphikhaiboRnd,

Checker,Counternhccmodulengin.

Bcutin,chngtato3modulengin.nnt ,hocsdngtrnhnng cnh trn Tree View thm vo mt module n gin. Ca s ModulePropertiesxuthin,chntabReneralvgvoNametncamoduleRnd.

ChntabParametersnhnghaccthams(ccthamsnycthscccRNGsdng),bngcchnybncthcuhnhlisauny.


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Chn tabGates v khaibomt cng, qua cc s ngu nhin sinh ra s ctruyni.Bnc thsdng trngEnd-linecommentvitch thchchochcnngcacng.

BygimoduleRndsnsngvbncthiukhinhotngcamodulenythngquaccfiletngngRnd.ccvRnd.h.

Tng tnh trn, ta tip tckhaiboccmodulengin ckiuCheckervCounter.

Tip theo ta thayikiucamimoduleconbn trongmodule rnd_evalchophhp vi cc kiumodule n ginmim ta va to ra.Kch chutphi vo tnmodulerng,chnProperties...,sauchntrongTypekiuRnd.


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Thayitngtiviccmodulecnli,sausavefileli.

Bn thy rngccmoduleconrng,checkervcounterccckiumoduletngng.Ngoi ra,nubnkchchutphivo simpleRndvchnShowNEDcode...,bnsthynhngkhaibobnthchintrongcasModulePropertiestrncthhindidngm:

QuaylivifielConductor.ned,filenysdngmodulernd_eval,mtmodulekt hp c nh ngha trong file Random_Number_Evaluator.ned.Do bn


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phi import file Random_Number_Evaluator.ned c th s dng modulernd_eval.

nnt vchnmcImports

GtnRandom_Number_EvaluatorvotrngName(chkhnggthmphnmrng.ned).Ngoirabncththmvocclichthchhaicttiptheo.

Savefileconductor.ned.

Bnhonthnhmtmhnhmngngin.chycmhnhny,bnphitrinkhaiccmodulengintrongC++vxydngccfile.exe.


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5. MODULEN GIN

5.1Module

n

gin

trong

OMNeT++

Ta sdngC++xydngccsimplemodule thchincc skin,haynikhcilthchincchotng(behaviour)camhnh.

Cc module do ngi lp trnh xy dng thng l cc lp k tha t lpcSimpleModuletrongthvincaOMNeT++.

Mimodulethngchacchmsau:

voidinitialize()

voidhandleMessage(cMessage*msg)

voidactivity()

voidfinish()

Hmkhitoinitialize()Trongqutrnhkhito,OMNeT++sxydngmng:ntoraccmodulenvccmodulekthp(compoundmodule).Sauktnichng theocckhaibovnhnghatrongfileNED.

HmhandleMessage()andactivity()Cchmnycgikhitrongqutrnhxlskin.Nhvyhuhthotngca h thng c m phng s c lp trnh trong cc hm ny. HmhandleMessage() s c nhn mphng (simulation kernel) gi khimodule nhn

cmtgitin.V thngthng,tachyuxydnghmhandleMessage()thayvhm activity().

Hmfinish()Hm finish()cgikhiqu trnhm phngkt thc thnhcng.Ngoi ra,mtngdngchyucahmnycnlthuthpccthngkvqutrnhmphng.

5.2CcskintrongOMNeT++OMNeT++sdngccmessagebiudinccskin.Miskincbiudin

bimtitngcalpcMessagehoclpconcalpny.

5.3MhnhhohotngtruyngitinTng tnh trnhby trongphn2.1.4, Mtktnic thcba thamsctrng.Nhng thamsny rt thun tinchoccmhnhmphngmng thng tinnhngkhnghudnglmchocckiumhnhkhc.Bathamsnybaogm:

trngtruyn(propagationdelay) tnhbngs-giy.


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Tslibit,ctnhbngsli/bit.

Tsdliu,ctnhbngsbit/s.

Cc thamsny ltuchn.Gi trcacc thamsny lkhcnhau trn tngktni,ph thucvokiuca linkt (haycngi lkiucaknh truyn -channeltype).

5.4Khaibokiumodulengin5.4.1TngquanMtmodulevitbngC++baogm:

Khaibolpmodule:lpdongilptrnhxydngllpconcalpcSimpleModule.

ngkkiucamodule(moduletyperegistration):Define_Module()hocDefine_Module_Like() macro.

Trinkhaicthlpmodule.

XtVDsau:

//file:swp.cc#include

//moduleclassdeclaration:classSlidingWindowProtocol :publiccSimpleModule{Module_Class_Members(SlidingWindowProtocol, cSimpleModule,0)virtualvoidhandleMessage(cMessage*msg);

};

//moduletyperegistration:Define_Module(SlidingWindowProtocol );

//implementationofthemoduleclass:voidSlidingWindowProtocol::handleMessage( cMessage*msg){...}

ModuletrnckhaibotrongfileNEDnhsau:

//file:swp.ned


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simpleSlidingWindowProtocol parameters:windowSize:numericconst;

gates:in:fromNetw,

fromHigherLayer;

out:toNetw,toHigherLayer;

endsimple5.4.2ngkkiumoduleTrongVDtrnchaculnh:

Define_Module(SlidingWindowProtocol); DnglnhnyskhinchoOMNeT++bitrngtamundnglpSlidingWindowProtocol didng1modulen.ngthiOMNeT++frameworkstmfileNEDccngtnchakhaibovmoduleny(simpleSlidingWindowProtocol...endsimple)

xcnhcccngvccthamsmmodulenycnc.

5.5XydnghmchoModule5.5.1HmhandleMessage()HmhandleMessage()cgikhimimessagenmodule.Khihmnysxlgitinvtrliktqungaylptc.

Ch rng ccmodule hmhandleMessage()KHNG c t ng gi,mphinhncgitin tmodulekhc.Muntaphi thmccself-message thmkhitoinitialize()thhmhandleMessage()sbtulmvicmkhngcnphinhngitintmodulekhc.

sdnghmhandleMessage()trongmtmodule,taphixcnhkchthc cazerostacksizechomodule.Bilkchthccazerostack skhinOMNeT++

bittamunsdnghmhandleMessage()hayactivity().

MtshmthngdngmtacthsdngtronghmhandleMessage():

Cchmsend():gigitinticcmodulekhc.

HmscheduleAt():nhkmtskin (thng lmodule tgigi tinchochnhn)

HmcancelEvent():hybnhkmtskinnhhmscheduleAt()

Chrngcchmreceive()v wait()khngcsdngtrongvicxydnghmhandleMessage(),mchdngkhitamunxydnghmactivity().

VD1:


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classFooProtocol:publiccSimpleModule{protected://statevariables//...

virtualvoidprocessMsgFromHigherLayer(cMessage*packet);virtualvoidprocessMsgFromLowerLayer(FooPacket *packet);virtualvoidprocessTimer(cMessage*timer);

public:Module_Class_Members(FooProtocol, cSimpleModule,0);virtualvoidinitialize();virtualvoidhandleMessage(cMessage*msg);

};

//...

voidFooProtocol::handleMessage( cMessage*msg){if(msg->isSelfMessage())processTimer(msg);

elseif(msg->arrivedOn("fromNetw")) processMsgFromLowerLayer(check_and_cast(msg));

elseprocessMsgFromHigherLayer(msg);

}5.5.2Hmactivity()Cchmquantrngmtacthgitronghmnybaogm:

receive()

wait()

send()

scheduleAt()

cancelEvent()

end()


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5.5.3Hminitialize()vfinish()Hminitialize():khitoccgitrcnthitchoqutrnhmphng

Hmfinish():hmnycsdngghiliccthngs trng thicn thitkhiqutrnhmphngktthc.

5.6Givnhnccmessage5.6.1GiccmessageSaukhitoraccgitin,tacthginthngquamtcngvo/ranhhmsend()vicphpnhsau:

send(cMessage*msg,constchar*gateName,intindex=0);send(cMessage*msg,intgateId);send(cMessage*msg,cGate*gate);

Vd:

send(msg,"outGate");send(msg,"outGates",i);//sendviaoutGates[i]

onmsaustoravgiccgitinsaumi5giy.

intoutGateId=findGate("outGate"); while(true){send(newcMessage("packet"),outGateId);wait(5);}5.6.2BroadcastsKhitamuncngmtgitintinhiuntchngthi,thdngphngphptoranhiubnsaocagitinvgichngi.

Vd:

for(inti=0;idup();send(copy,"out",i);

}deletemsg;


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5.6.3Gictr(Delayedsending)wait(someDelay);send(msg,"outgate");

Cphpcngtngtnhtrn,chthmthamsthigiantr

sendDelayed(cMessage*msg,doubledelay,constchar*gateName,intindex);sendDelayed(cMessage*msg,doubledelay,intgateId);sendDelayed(cMessage*msg,doubledelay,cGate*gate);

Vd:

sendDelayed(msg, 0.005,"outGate");5.6.4GitrctipmessageSdnghmsendDirect()gitrctipgitintmodulenytimodulekiamkhngcnquantmnthngquacngno.

sendDirect(cMessage*msg,doubledelay,cModule*mod,intgateId)sendDirect(cMessage*msg,doubledelay,cModule*mod,constchar*gateName,intindex=-1)sendDirect(cMessage*msg,doubledelay,cGate*gate)

Vd

cModule*destinationModule=parentModule()->submodule("node2"); doubledelay=truncnormal(0.005,0.0001);sendDirect(newcMessage("packet"),delay,destinationModule, "inputGate");5.6.5GinhkscheduleAt(absoluteTime, msg);scheduleAt(simtime()+delta,msg);

5.7Truynhpcccngvktni5.7.1itngcng(gateobject)Modulecnglmtitngcalp cGate.Hmgate()strv1contrtiitngcGate.Vmuntruycpvotngthnhphncacng,tathchinchnghm

cGate*outgate=gate("out");cGate*outvec5gate=gate("outvec",5);


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GateIDCcmodulecngclutrtrongmtmng.VitrcacngtrongmngilgateID.xcnhgateID,tadnghmid()hochmfindGate()intid=outgate->id();or:intid1=findGate("out");intid2=findGate("outvect",5);

Nh,cthgivnhngitinthngquathamslgateID.ThngthngthvicsdnggateIDsnhanhhnldngtncng.

5.7.2CcthamsktniCcthngsthngscbncangtruyn:tr,tlbitli,tctruync

biudinthngquaitngchannel.

cChannel*chan=outgate->channel();

cBasicChannel*chan=check_and_cast(outgate->channel()); doubled=chan->delay();doublee=chan->error();doubler=chan->datarate();

5.8TngtomoduleTrongmtstnhhung,tacnphitngtovhyccmodule.Chnghnkhimphngmtmngding,tacntomtmodulemikhingidngtinvovngktnivhymodulenykhingirakhivngktni.

Qutrnhtrngm5bc:

1. Tmloimodule.

2. Tomodule

3. Thitlpccthamsvkchthccng(nucn)

4. Gihmxydng(buildout)ccmoduleconvhonthnhmodulechnh.

5.

Gi

hm

to

cc

gi

tin

ch

ng

(activation

message)

cho

mi

module

n.Vd:

//findfactoryobjectcModuleType*moduleType=findModuleType("WirelessNode");

//create(possiblycompound)moduleandbuilditssubmodules(ifany)


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cModule*module=moduleType->create("node",this);module->buildInside();

//createactivationmessagemodule->scheduleStart(simTime());Hymodulemodule->deleteModule(); ToccktnisrcGate->connectTo(destGate); To2modulevktnichngvinhau:cModuleType*moduleType=findModuleType("TicToc"); cModule*a=modtype->createScheduleInit("a",this);cModule*b=modtype->createScheduleInit("b",this);

a->gate("out")->connectTo(b->gate("in")); b->gate("out")->connectTo(a->gate("in")); HyktnisrcGate->disconnect();


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6. MESSAGE

6.1.Message

v

Packet

6.1.1.LpcMessagecMessagelmtlp trungtmcaOMNeT++.itngca lpcMessagevcclpconcancthmhnhhocrtnhiuitngnhccmessage,ccgitin(packet),frame,cell,bit,cctnhiutruyntrongmng,ccthcthtruyntrongmththng...

ThuctnhMtitngcalpcMessagecmtsthuctnh,mtscsdngbiphnnhnmphng,mtskhcccungcpchongilptrnh.

Tn-name: thuc tnh lmtchui(constchar*)mngilp trnhcthsdngtu.TncamessagexuthinrtnhiunitrongTkenvvnncchncngha.ThuctnhnykthatlpcObject.

Kiu message - message kind: thuc tnh ny cha thng tin v kiu camessage.

di-length(c tnh theobit):csdng tnh trkhimessagec truyn thngquamtktnic tc truynd liucgngi trxcnh.

Cbit li -bit error flag: thuc tnh ny c thit lpbng truebiphnnhnmphngvixcsutbng1-(1-ber)lengthkhimessagecgithng

quamtktnictctruyndliuxcnh(ber). Quynu tin -priority:c sdngbiphnnhnmphng spxp

ccmessage trong danh sch hng i (message queue -FES) c cng thigianti.

Mcthigian-timestamp:thuctnhnychophpngisdngnhduthigianvdnhnhduthiimmessagecxpvohngihoccgili.

Cc thuc tnhkhcvcc thnhphnd liugipchongi lp trnh lmvicddnghnnh:danhsch thams (parameter list),messagenggi(encapsulated message), thng tin iu khin (control info) v con tr ngcnh(contextpointer.

Mt s cc thuc tnh ch c (read-only attribute) lu gi cc thng tin vvicgimessage,ccthngtinvccmodule,cngngunvch,thigiangivthigianticaccmessage.HuhtccthuctnhnyucsdngbiphnnhnmphngkhiccmessagenmtrongFES,tuynhinkhiccmodulenhncmessage,ccthngtinnyvncntnti.

Cchsdng


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HmkhitocalpcMessagecthnhnmtviis.Thngthng,mtitngca lpcMessagesnhnvohaiis l tn(kiustring)vkiumessage(kiuint):

cMessage*msg=newcMessage("MessageName",msgKind);

Ttcccisultuchn,dokhaibomtitngnhsaucnghpl

cMessage*msg=newcMessage();

hay

cMessage*msg=newcMessage("MessageName");

Khikhngcis,mcnhitngmitoractnlvkiul0.Hmtoca lpcMessagec thnhnvonhiui shn (length,priority,biterror flag),tuynhintgitrchoccthuctnhtacngkhngnhtthitphisdnghmto.Tacthsdnghmset...()gngitrchotngthuctnh.

msg->setKind(kind);

msg->setLength(length);

msg->setPriority(priority);msg->setBitError(err);

msg->setTimestamp();

msg->setTimestamp(simtime);

Ngoiratacthsdngcchmsaulygitrcaccthams:

intk=msg->kind();

intp=msg->priority();

intl=msg->length();

boolb=msg->hasBitError();simtime_tt=msg->timestamp();

NhnimessageTacththchinsaochpmtmessagebngcch:

cMessage*copy=(cMessage*)msg->dup();

hoc

cMessage*copy=newcMessage(*msg);

Cchny c thpdngvibtkmti tngno trongOMNeT++.Messagemictolmtbncopychnhxccamessagec,baogmcccthams...

6.1.2.Self-MessageSdngself-messageCcmessage thng c s dng m t cc s kin xy rabn trong camtmodule.Trongmts trnghp,messagecthcoinhmtbnh thidngxcnhthiimdinramtskinno.Nhngmessagesdngtrongnhng


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trnghpnhvycgilself-message.Tuynhinself-messagevnlmessagebnhthng,lmtitngcalpcMessagehocmtlpconkthatn.

Khimtmessagecphnnmtmodulebiphnnhnmphng,bncthgihmisSelfMessage()kimtraxemncphilmtself-messagehaykhng;nimt cch khc l kim tra xem message nhn c cphi l mt scheduledmessage(ccmessagedngnhthiimdinramtskintrongmodule)haylccmessagecgibimthmsend...()no.Ngoirangisdngcths dng hm isScheduled() kim tra, hm ny s tr v true numessage nhnc l mt scheduled message (nhng message c xc nh bi hmscheduleAt()).MtscheduledmessagecngcthbhubbihmcancelEvent().

boolisSelfMessage();

boolisScheduled();

Cchmsautrvthigianto,thitlpvthigianticamtmessage.simtime_tcreationTime()

simtime_tsendingTime();

simtime_tarrivalTime();Khimtself-messagecthitlp, thigian ticamessages l thigiannscchuyntimodulecnthit.

Contrngcnh(ContextPointer)XthaihmsetContextPointer()vcontextPointer():

HmsetContextPointer()nhnmtcon trngcnh (kiuvoid) lmis thitlpngcnhchomessage.

HmcontextPointer()trvmtcontrkiuvoid,changcnhcamessagetngng.

void*context=...;

msg->setContextPointer(context);

void*context2=msg->contextPointer();

Ngilptrnhcthsdngcontrngcnhchonhiumcchvphnnhnmphng khng can thip n con tr ny. Tuy nhin trn thc t, con tr ng cnhthngc sdngkhimtmodule thit lpmtvi self-message (bnh thi),modulescnphixcnhckhinomtself-messagequaylimodule,haynimtcchkhcncnphixcnhckhinobnhthihotngvphilmgsau.Khicontrngcnhsctoratrtimtcutrcdliucamodule,mangythngtinngcnhvskinspdinra.

6.1.3.MhnhhogitinCngnhnvthigianticamtmessageCchmchravtrnhnvgicamtmessage:

intsenderModuleId();

intsenderGateId();


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giiphngchngkhichngbxakhidanhsch.Nhngvicnyc thchinqua hai hm take() v drop(). V d thm vo lp mt std::list c gi lmessageschadanhschcccontrmessage,bnnnthmonmsau:

voidMessageBundleMessage::insertMessage(cMessage*msg)

{

take(msg);//takeownership

messages.push_back(msg);//storepointer

}

voidMessageBundleMessage::removeMessage(cMessage*msg)

{

messages.remove(msg);//removepointer

drop(msg);//releaseownership

}

Bncngcnphithmvomthmoperator=()mboccitngmessagecabncthcsaochphocnhni(ylnhngiurtcnthittrongqutrnhmphng).

6.1.5.ThmitngvthamsThmitngLpcMessagecitngcArraycthchaccitngkhc.TuynhinchccitngkthatlpcObject(huhtcclptrongOMNeT++ukthatlpny) mi c th c thm vo cc message. Cc hm addObject(), hasObject(),removeObject()nhntncaccitngnhcckhotruynhpmng.Vd:

cLongHistogram*pklenDistr=newcLongHistogram("pklenDistr");msg->addObject(pklenDistr);

...

if(msg->hasObject("pklenDistr"))

{

cLongHistogram*pklenDistr=

(cLongHistogram*)msg->getObject("pklenDistr");

...

}

Bnphicn thn khi thmmti tngvomessage, trnhxy ra tnh trngxungtgiaccitngbtrngtn.NubnkhnggnkmmtitngnovomessageanhkhnggihmparList(),itngcArrayskhngcto.

Bn cng c th thmvomessage cci tngkhng k tha t cObject (non-cObjectobject)bngcchsdngcontrcalpcPar.Vd:

structconn_t*conn=newconn_t;//conn_tisaCstruct


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msg->addPar("conn")=(void*)conn;

msg->par("conn").configPointer(NULL,NULL,sizeof(structconn_t));

ThmthamsPhngphpttnhtmrngccmessagevinhngtrngdliumilnh

ngha

cc

message

(xem

phn

5.2).

Tuynhin tac th sdngmtphngphpkhc (khngckhuynkhch)thmcctrngdliumichomessagethngquaccitngcPar.Nhcimcaphngphpny l tnbnhv thigian thchinchm.Cci tngcacParthngckch thclnvkhphctp.MtkhckhisdngccitngcParcngrtdsinhralibiccitngnyphicthmvongvclpivimiitngmessage.

TuynhinnubnvncnsdngcPar,nscungcpchobnmtshmcbn.HmaddPar()cdngthmmtthamsmichomessage.HmhasPar()kimtra xemmtmessage c cc tham s hay khng.Cc tham s camessage c thc truynhp thngquachscamng thams.HmfindPar() trvchsca

mtthamsvtrv-1nuthamskhngtnti.Ccthamscngcthctruynhpbngcchvitchnghmpar().Vd:

msg->addPar("destAddr");

msg->par("destAddr")=168;

...

longdestAddr=msg->par("destAddr");

6.2.nhnghamessage6.2.1.GiithiuTrongthct,bnsphithmrtnhiutrngvolpcMessagelmchonddnghn.Lyvd,nubnmhnhhoccgitintrongmtmngthngtin,bncnccchluphnheadercagiaothctrongccitngmessage.Mtcchtnhin,chng ta thyrngthvinmphngcaOMNeT++cvittrnngnngC++,dothmcctrngmivolpcMessagetacthtocclpconkthatlpcMessagevthmcctrngvonhnhngthnhphnringcalpcon.Tuynhin,domitrngmbnthmvoucntnht3thnhphn(dliuthnhphn ring,hmset() thit lpgi trvhmget() trvgi tr)v lpmicnphictchhpvinntngmphngnnvicsdngC++thcslmtcngvicbuntvmtthigian.

OMNeT++cungcpchongisdngmtphngphplmvichiuquhn,lnhnghaccmessage.Nhngnhnghanysdngmtcphprtngngnm tnidungcaccmessage.MC++s tngsinhradavonhngnhnghanyvbnhontonckhnngsalinhngoncodechothchhpvtngcabn.

Lpmessageutin


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Taxtmtvdngin.Gisrngbncnccitngmessagephicthmachcangun,chvbmbctruyn,bncthvitmtfilemypacket.msgnhsau:

messageMyPacket

{

fields:

int srcAddress;

intdestAddress;

inthops=32;

};

Nubnbindchfilemypacket.msg,trnhbindchstngsinhrahaifileC++tngngc tn lmypacket_m.hv filemypacket_m.cc.Filemypacket_m.hchacckhaibocalpMyPacket(lpC++tngngvinhnghamessagetrongfilemypacket.msg)vbncthtfilenyvotrongmC++iukhinhotng

ca

i

tng

MyPacket.

Filemypacket_m.hschacckhaibolpnhsau:

classMyPacket:publiccMessage

{

...

virtualintgetSrcAddress()const;

virtualvoidsetSrcAddress(intsrcAddress);

...

};

DotrongfileC++bncthsdnglpMyPacketnhsau:

#include"mypacket_m.h"

...

MyPacket*pkt=newMyPacket("pkt");

pkt->setSrcAddress(localAddr);

...

File mypacket_m.cc cha cc trin khai ca lpMyPacket chophpbn kim tranhngcu trcd liu tronggiaodincaTkenv(TkenvGUI).Filemypacket_m.cc

nn

c

bin

dch

v

thit

lp

lin

kt

vi

m

hnh

m

phng

ca

bn

(nu

bn

sdngcngcopp_makemake toccmakefiles, thcccngvic linquannfile.ccstngcthchin).

Khinim-nhnghamessageC nhiu kin khng r rng v mc ch cng nh khi nim v nh nghamessage.Tuynhinchng taphixcnh r rng rng,nhnghamessagekhng

phil:


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... scgngmphngccchcnngcaC++nhngvimtcphpkhc.Chnginvicnhnghamessagechlxcnhccdliu(hayxcnhmtgiaotiptruynhptidliu)chkhngphilbtkmtkiuthuctnhno.

...mtcngcsinhm.iunychngvivicnhnghanidungcamessagevcccu trcd liumbn sdng trongmessage.Vicnhnghacchmkim sot hot ng camessage khng c h tr.Hn na c vic s dng c

phpnysinhracclpvcccu trcbntrongcaccmodulengincngkhngckhuynkhch.

6.2.2.Sdngenumenum{...}sdng trongkhainhnghamessagescchuyn thnhkiuenumthcs trongC++.y lmti tngdngchaccgi tr textidinchocchng s. Vic sdng enumchophp hin th tn didngbiu tng trongTkenv.

Vd:

enumProtocolTypes

{

IP=1;

TCP=2;

};

Ccgitrtrongenumphilduynht.

6.2.3.KhitochomtmessageCchkhitocbnBn

c

th

m

t

mt

message

theo

c

php

sau:

messageFooPacket

{

fields:

intsourceAddress;

intdestAddress;

boolhasPayload;

};

Trnhbin dch s dch onm t trn thnhmt fileC++ vimt lp c tn lFooPacket.FooPacketny s lmt lpconca lpcMessage.ivimi trngtrongonkhaibotrn,tronglpC++tngngcngscmtthnhphndliuring,mthmsettervmthmgetter.DoFooPacketscnhnghmsau:

virtualintgetSourceAddress()const;

virtualvoidsetSourceAddress(intsourceAddress);

virtualintgetDestAddress()const;

virtualvoidsetDestAddress(intdestAddress);


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virtualboolgetHasPayload()const;

virtualvoidsetHasPayload(boolhasPayload);

Ch lttccchm trnuckiu lvitual, tclbnckhnng thchinchnghmcclpcon.

Haihmtocngcsinhra:mtnhptnitngvkiumessagevmtl

hmtosaochp(tomtitngmilbnsaocaitngc).

FooPacket(constchar*name=NULL,intkind=0);

FooPacket(constFooPacket&other);

Ngoira trnhbindchcng tngsinh ra trong lpcchmnhoperator=()vdup()(cchmdngsaochpvnhnbnitng).

Bncthsdngcckiudliudiykhaibochocctrngtrongnhnghamessage:

bool

char, unsigned char

short,unsignedshort

int,unsignedint

long,unsignedlong

double

Gitrkhitocacctrngmcnhbng0.

GitrkhitoBncthkhitogitrchocctrngtrongmtmessagetheocphpsau:

messageFooPacket

{

fields:

intsourceAddress=0;

intdestAddress=0;

boolhasPayload=false;

};

PhnmkhitotrongonkhaibotrnscthaythbicchmtotrongcclpC++.

KhaibokiuenumBnc thkhaibocc trngkiu int (haycckiu snguynkhc)nhngi trtrongmtenum.Trongtrnghpsdngenum,trnhbindchcthsinhmcho

phpTkenvhinthgitrcatrngdidngccbiutng.

Vd:

messageFooPacket

{


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fields:

intpayloadTypeenum(PayloadTypes);

};

Kiuenumphickhaiboringrtrongfile.msg.

MngkchthccnhCthsdngccmngckchthccnh:

messageFooPacket

{

fields:

longroute[4];

};

Trongtrnghpnycchmgettervsetterscthmmtthamsphlchscamng.

virtuallonggetRoute(unsignedk)const;

virtualvoidsetRoute(unsignedk,longroute);

MngngmessageFooPacket

{

fields:

longroute[];

};

Trongtrnghpny,lpC++csinhrascthmhaihm,ngoicchmsettervgetterbnhthng.Mthmtkchthccamngvhmcnlitrvkchthchinticamng.

virtuallonggetRoute(unsignedk)const;

virtualvoidsetRoute(unsignedk,longroute);

virtualunsignedgetRouteArraySize()const;

virtualvoidsetRouteArraySize(unsignedn);

Hm set...ArraySize()cpphtbnhchomtmngmi.Ccgi tr tn ti trongmngscduytr(csaochpsangmtmngmi).

Kch thcmc nh camng l 0.iu ny c ngha lbn cnphi gi hmset...ArraySize()trckhibncthbtunhpccphntcamng.

Chui

messageFooPacket

{

fields:


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stringhostName;

};

Cchmgettervsetterscdngnhsau:

virtualconstchar*getHostName()const;

virtual

void

setHostName(const

char

*hostName);

Ch:mtchuikhcvimtmngk t.Mngk tccoinh lmtmngthngthng.

Vd:

messageFooPacket

{

fields:

charchars[10];

};

Cchmgettervsettertngngsl:

virtualchargetChars(unsignedk);

virtualvoidsetChars(unsignedk,chara);

6.2.4.QuanhkthavhpthnhNhngphntrnnivvicthmcctrngdliucbn(int,double,char,...)vomtmessage.ivinhngmodulenginnhvy lkh tuynhinivinhngmodulephctp,bncncn:

Thitlpcutrcphncpchocclpmessage,nghalcclpmessagekhngchkthatlpcMessagemcncthkthatnhnglpdobntora.

Cctrngdliutrongmessagekhngchlnhngkiudliucbnmncnc th lcccu trc (struct),cc lphoccckiud liudongidng tnhngha.

QuanhkthagiacclpmessageMcnh,cclpmessageulcclpconkthatlpcMessage,tuynhinbncthsdngmtlpcskhcthngquatkhoextends

messageFooPacketextendsFooBase

{

fields:

...

};

Theovdny,lpC++tngngscdngnhsau:

classFooPacket:publicFooBase{...};

Khaibolp


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Cphpkhaibomtlpcngtngtnhcphpkhaibomtmessagechkhcnhautkha,classthaychomessage.

classMyClassextendscObject

{

fields:

...

};

ChrngnukhaibomtlpmkhngctkhoextendsthlpctoraskhngckthatlpcObject.Dotronglpskhngcmtshmnhname(),nameClass(),...tomtlpcynhnghmnynhtthithmphickhaiboextendscObject.

KhaibocutrcBncthtocccutrckiuCsdngnhcctrngdliutrongcclpmessage.CutrckiuCcnghalchchadliuvkhngchm(trongthc

tthcutrctrongC++cthchacchm).Cphpkhaibostruct:

structMyStruct

{

fields:

chararray[10];

shortversion;

};

Cphpkhaibonycngtngtnhcphpkhaibomessage.TuynhinphnmC++sinhralikhcnhau.Cccutrcctngsinhraskhngccchmsetter v getter, thay vo cc thnhphn d liu ca struct c kiu truy xut l

public(ccdliuthnhphntrongmessageckiutruyxutlprivate-khngchophp truy xut tbn ngoi).i vion khaibo trn,phnm sinh ra s cdngnhsau:

//generatedC++

structMyStruct

{

chararray[10];

shortversion;

};

Cctrngcamtstructcthckiudliucbnhoclmtstructkhcnhng nkhngthckiuchuihocchamtlp.

Quanhkthacngchtriviccstruct:

structBase


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{

...

};

structMyStructextendsBase

{

...

};

Bivmtcutrckhngchacchmthnhphn,doncmtsgiihn:

Khnghtrccmngng(khngthkhaibocchmcpphtbnhchomng).

Cc trng tru tng (generation gap)khngc s dng,biv chngcxydngdatrncchmo.Khinimtrng trutng(abstractfield)scmtphnsau.

SdnglpvcutrctrongmessageNubncmtcutrckhaiboctnlIPAddress,bncthsdngntrongmessagenhsau:

messageFooPacket

{

fields:

IPAddresssrc;

};

CutrcIPAddressphickhaibotrctrongfile.msghocnphilmtkiuC++(xemphnAnnouncingC++types).

Cchmgettervsettertngng:

virtualconstIPAddress&getSrc()const;

virtualvoidsetSrc(constIPAddress&src);

6.2.5.SdngcckiucsncaC++Nubnmunsdngcckiud liu tmnhnhngha trongccmessage,bncnphithngbokiudliuvitrnhbindchmessage.

GisbnckhaibomtcutrcctnIPAddresstrongfileipaddress.h:

//ipaddress.h

structIPAddress

{

intbyte0,byte1,byte2,byte3;

};

c thsdng IPAddress trongmessage, filemessage(c tn lfoopacket.msg)nnchaonmsau:


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cplusplus

{{

#include"ipaddress.h"

}};

struct

IPAddress;

Tc dng ca ba dng u tin ch n gin l sao chp cu lnh #includeipaddress.hvo trong file foopacket_m.h trnhbindchbitv lp IPAddress.Trnhbindchskhngcgngkimtranghacaccontextnmtrong thncakhaibocplusplus{{...}}.DngtiptheoschrchotrnhbindchIPAddresslmtcutrc.Nhngthngtinnysnhhngnphnmcsinhra.

Tngtnhvytrongtrnghpbnmunsdngmtlptrongmessage,gistnlplsSubQueuethdngcuicngtrongonkhaibobnilil:

classcSubQueue;

Cphp trnc sdng trong trnghpcc lpu l lp con trc tip hoc

gin

tip

ca

lp

cObject.

Nu

mt

lp

khng

c

quan

h

tha

k

vi

lp

cObject

thbnphi s dng thm t kho noncobject (nu khng trnhbin dchmessage snhmvfilectorasgyralikhibindchbngtrnhbindchcaC++):

classnoncobjectIPAddress;

6.2.6.ThayiccfileC++MuGenerationGapikhibncncconmtsinhracththchincnhiuhnhockhcisovinhnggmtrnhbindchtothnh.Lyvd,khitmttrngsnguynctnlpayloadLength,cthbnscnchnhsachiudicagitin.Tuynhin

on

m

t

sinh

ch

cha

hm

setPayloadLength(),

iu

ny

khng

thch

hp

pngyucutra.

voidFooPacket::setPayloadLength(intpayloadLength)

{

this->payloadLength=payloadLength;

}

tho mnyucu,hmsetPayloadLength()nncdngnhsau:

voidFooPacket::setPayloadLength(intpayloadLength)

{

intdiff=payloadLength-this->payloadLength;

this->payloadLength=payloadLength;

setLength(length()+diff);

}

Bnhthng,nhcimlnnhtca vicsinhmtnglskhkhnkhithomccyucucangisdng.Vicchnhsabngtayliccfiletngnyl


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FooPacket&operator=(constFooPacket&other)

{ FooPacket_Base::operator=(other)

; return*this;

}

virtual

cObject

*dup()

{

returnnewFooPacket(*this);

}

};

Register_Class(FooPacket);

Quaytrvvivdvthayichiudigitin,tacthvitonmnhsau:

classFooPacket:publicFooPacket_Base

{

//herecomethemandatorymethods:constructor,

//copycontructor,operator=(),dup()

//...

virtualvoidsetPayloadLength(intnewlength);

}

voidFooPacket::setPayloadLength(intnewlength)

{

//adjustmessagelength

setLength(length()-getPayloadLength()+newlength);

//setthenewlength

FooPacket_Base::setPayloadLength(newlength);

}

TrngtrutngMcchcatrngtrutnglchophpngisdngcthvitchnglicchthcgitrcatrngclutrbntronglp.Bncthkhaibobtktrngnoltrngtrutngvicphpsau:

messageFooPacket{

properties:

customize=true;

fields:


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abstractboolurgentBit;

};

Vimttrngtrutng,trnhbindchstoramtthuctnhcalpkhngcd liu thnhphnvcchmgetter/setters tr thnhcchmthuno (cchmthunolcchmkhngcthnhm):

virtualboolgetUrgentBit()const=0;

virtualvoidsetUrgentBit(boolurgentBit)=0;

6.2.7.SdngSTLtrongcclpmessageVicsdngcctrngtrutngcnchophpngisdngcthdngcclpvectorhocstacktronglpmessage.

Xtnhnghamessagediy:

structItem

{ field

s: int

a;

doubleb;

}

messageSTLMessage

{

properties:

customize=true;

fields:abstractItemfoo[];//willusevector

abstractItembar[];//willusestack

}

Nubnbindchonkhaibo trn,phnmsinhraschbaogmmtcphmtngngvihai trng foovbar,khngc thnhphnd liuvkhngchmnockhaiboc th.Bnc th thayi limi th,c th trinkhai liccthuctnhfoovbarvikiustd::vectorvstd::stack:

#include

#include

#include"stlmessage_m.h"

classSTLMessage:publicSTLMessage_Base

{


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protected:

std::vector foo;

std::stack bar;

public:

STLMessage(const

char

*name=NULL,

int

kind=0)

:

STLMessage_Base(name,kind)

{}

STLMessage(const STLMessage& other) : STLMessage_Base(other.name()){operator=(other);}

STLMessage&operator=(constSTLMessage&other){

if(&other==this)return*this;

STLMessage_Base::operator=(other);

foo=other.foo;

bar=other.bar;

return*this;}

virtualcObject*dup(){returnnewSTLMessage(*this);}

//foomethods

virtualvoidsetFooArraySize(unsignedintsize){}

virtualunsignedintgetFooArraySize()const{returnfoo.size();}

virtualItem&getFoo(unsignedintk){returnfoo[k];}

virtualvoidsetFoo(unsignedintk,constItem&afoo){foo[k]=afoo;}

virtual

void

addToFoo(const

Item&

afoo)

{foo.push_back(afoo);}

//barmethods

virtualvoidsetBarArraySize(unsignedintsize){}

virtualunsignedintgetBarArraySize()const{returnbar.size();}

virtualItem&getBar(unsignedintk){thrownewcRuntimeException("sorry");}

virtualvoidsetBar(unsignedintk,constItem&bar)

{thrownewcRuntimeException("sorry");}

virtualvoidbarPush(constItem&abar){bar.push(abar);}

virtualvoidbarPop(){bar.pop();}

virtualItem&barTop(){returnbar.top();}

};

Register_Class(STLMessage);

Mtsch:

CchmsetFooArraySize(),setBarArraySize()ltha.


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HmgetBar(intk)khngthctrinkhaivkiustackkhngchophptruynhpccphnttheochs.

HmsetBar(intk,constItem&)cngkhngctrinkhaicngvildonhtrn.


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7. CHY CC NG DNG OMNeT++Nh trnhbyphnm u,mth thngmngmphng trongOMNeT++

gmccthnhphnsau:

Ccfile.nedmttopomng.

Ccfilecphnmrng.msgchakhaiboccmessage

CcfileC++(cphnmrngl.cctrongUNIXhoc.cpptrongWindows)

Qutrnhxydngmtchngtrnhmphng:

u tin, dch cc fileNED v cc filemessage thnhC++, s dngNEDcompiler(nedc)vmessagecompiler(opp_msgc).

QutrnhtiptheogingnhbindchmngunC/C++:

oTrong

Linux:

cc

file

.cc

file

.o.

o TrongWindows:ccfile.cppfile.obj.o Sau,ttcccfiletrnsclinkt(link)viccthvincn

thittothnhfile.exe.

Cth,tacnphilinktviccthvinsau:

Phn nhn m phng c gi l sim_std (nh cc file libsim_std.a,sim_std.lib,etc).

Giaodinngidng:cung cp thvinmi trng (file libenvir.a, etc)vcc tin ch tkenv v cmdenv (libtkenv.a, libcmdenv.a, etc). Cc file .o(hoc .obj)phi c lin kt ti th vinmi trng cng vi hoc tkenv

hoccmdenv.

Hnhdiychochngtahnhnhqutrnhxlkhimhnhcxydngvhotng.


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HnhI-7.1-Qutrnhxydngvthchinmhnh

7.1SdnggccToMakefile:

Saukhixydngxongccfilengun*.ned,*.msg,*.cc,*.htrongcng1thmchyg

%opp_makemakeLnhnystorafilectnlMakefile.Saugtipmaketofilechy.Tncafilechynystrngvitnthmcchaccfilengun.

7.2SdngMicrosoftVisualC++

TngtnhtrongUNIX.Nugopp_nmakemaketrongthmcchaccfilengun*.ned,*.msg,*.cpp,*.hthstorafileMakefile.vc.opp_nmakemake

tofilechy,tag

nmake-fMakefile.vc


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8. M HNHN GIN - TICTOCminhhacchmphngmngbngOMNeT++,tasbtuvi1mngrtn

gin,chgm2nttraoidliu:1nttoragitinvntth2nhnvgitrligitinny. Chngtagi2ntnyl"tic"v"toc".

Ccbcxydngngdngtrn:

1.To1thmctnltictocvcdtithmcny.

2.Tofiletopomng.ttnltictoc1.ned:

simpleTxc1gates:in:in;out:out;

endsimple

////Twoinstances(ticandtoc)ofTxc1connectedbothways.//Ticandtocwillpassmessagestooneanother.//moduleTictoc1submodules:tic:

Txc1;

toc:Txc1;

connections:tic.out-->delay100ms-->toc.in;tic.in


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Tictoc1l1moduletnghp,gm2submodules,ticvtoc.2modulethnhphnnyulccitngcamoduleckiuTxc1.Sau,taktnicngracaticticngvocatocvngcli.trkhitruyn l100ms.

Txc1l1modulen(tclnccpthpnhttrongNEDfilevcvitbngC++).Txc1c1cngvotnlinv1cngrattnlout

(simple..

endsimple).

3.C++filetxc1.cc(UNIX)hoctxc1.cpptrongWindows#include#includeclassTxc1:publiccSimpleModule{//Thisisamacro;itexpandstoconstructordefinition.Module_Class_Members(Txc1,cSimpleModule,0);//Thefollowingredefinedvirtualfunctionholdsthealgorithm.virtualvoidinitialize();virtualvoidhandleMessage(cMessage*msg);

};

//ThemoduleclassneedstoberegisteredwithOMNeT++Define_Module(Txc1);

voidTxc1::initialize(){//Initializeiscalledatthebeginningofthesimulation.//Tobootstrapthetic-toc-tic-tocprocess,oneofthemodulesneeds//tosendthefirstmessage.Letthisbe`tic'.

//AmITicorToc?if(strcmp("tic",name())==0){//createandsendfirstmessageongate"out"."tictocMsg"isan//arbitrarystringwhichwillbethenameofthemessageobject.cMessage*msg=newcMessage("tictocMsg");send(msg,"out");

}


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6.Munchyc,tacnphitofileomnetpp.inibochotrnhmphngbittamunchymphngivimngno.iunycngcnghanhiumngcthchung1trnhmphng.

Fileomnetpp.initrongvdnycngrtngin

[General]

network=tictoc1

7.Sau,tasbtuchyngdngbnglnh:

-UNIX

$./tictoc

-Windows

>tictoc

Tasthycasmphnghinra


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ClickOK

8.NhnntRunbtuqutrnhmphngthy2ntmngtraoiccgitinchonhau.

Caschnhhinththigianmphng.Nhinthiimngvimilntruyntin.

9.Tacthhiuchnhchchy:dng-F8(STOPbutton),chytngbcF4) Vd:Stepmode


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10.MunthotchcnnClosehocchnFile|Exit.


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